CN103245769B - Long core water injection test simulation system - Google Patents
Long core water injection test simulation system Download PDFInfo
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- CN103245769B CN103245769B CN201310132940.1A CN201310132940A CN103245769B CN 103245769 B CN103245769 B CN 103245769B CN 201310132940 A CN201310132940 A CN 201310132940A CN 103245769 B CN103245769 B CN 103245769B
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Abstract
The invention provides a long core water injection test simulation system. The long-core water injection test simulation system comprises a long core clamper, a pressure pump, as well as a displacement pump, a manometer and a voltage return pump, wherein the pressure pump is connected with the long core clamper, and is used for applying confining pressure and axial compressive force to the long core clamper, and the displacement pump, the manometer and the voltage return pump are connected with the long core clamper; the long core clamper comprises a clamper barrel (1) and a high-pressure-resisting rubber sleeve (2) sleeved in the clamper barrel (1); the high-pressure-resisting rubber sleeve comprises a wall (21), an inner cavity (23) positioned in the wall (21) and ports positioned at two ends of the inner cavity (23); and the inner cavity (23) is vertical-tube-shaped, and the inner diameters of the ports at the two ends are equal to the inner diameter in the middle of the inner cavity (23). The long core water injection test simulation system can be used for performing axial detection at multiple pressure monitoring points on long cores, has a small end surface effect, small dead volume, large static confining pressure and small measurement error.
Description
Technical field
The present invention relates to petroleum prospecting detection field, be specifically related to a kind of long core water injection test simulation system.
Background technology
Rock core simulation water filling device conventional at present mainly divides short rock core and long cores two kinds of systems; although adopt conventional short rock core can the sensitivity characteristic of Fast Evaluation reservoir; and effectively can carry out the preferred and research of reservoir protection technology in the injecting process; but because the length of the short rock core of routine is too short, cannot the process of hydration and expansion of clay in accurate response reservoir the injecting process and migration and feature.In order to study the reservoir damage mechanism in the injecting process further; dynamically prevent on the basis of swollen experiment at the short rock core of routine; establish the experimental technique of long cores analogue means and long cores simulation water filling, carry out long cores simulation water filling reservoir damage and Protection research.But the multipoint pressure measure long cores device of routine exists following defect: 1, clean confined pressure is low, the rock core specification of conventional long cores device is Φ 25mm*300mm, can carry out two pressure tap test.But the bearing capacity of its gum cover is low, require to be less than 4MPa, cannot burden pressure under simulation stratum condition.2, dead volume is large, dead volume (or dead volume) exports from clamper entrance to clamper, the volume that all interface channels occupy, mainly comprise the connected volume of pipeline, plug, joint and valve, be distributed in clamper entrance and export to rock core rear end face and rock core pressure tap to the volume in the connection line of sensor to rock core front end face, clamper.Active volume refers in gum cover the volume holding long cores, namely equals the volume of long cores.
Dead volume is due to requirements such as mechanical processing technique, mounting process, overload protections in flow process, inevitably additional volume.The measuring accuracy, response time, response speed etc. of dead volume to system have a significant impact.Owing to adding the length of test point and gum cover and rock core, the test with short rock core is compared, and the dead volume of existing long cores device adds several times, and active volume proportion is less, and for the experiment of accurate measurement, the impact that its error causes is larger.Therefore, existing rock core simulation water filling device needs further improvement and improves.
In addition, existing triaxial core holder, packing element shape is all columniform, and have two kinds of methods from adding the division of confined pressure mode, one is axial and radial direction is pressurizeed simultaneously, and axially identical with radial pressure, and another kind is axial and radial direction can add confined pressure respectively.So to axially adding the core holding unit of confined pressure respectively with radial direction, the seal form of packing element and rock core end face is all generally that (namely the bore at packing element two ends is greater than interlude to convex shape, or two ends are enlarging), the major defect of this sealing means is: 1. because the requirement gum cover two ends of structure and processing technology must convex, this part gum cover of projection adds the dead volume of clamper front and back end, the response speed of oil-water metering precision and system in impact experiment.2. because gum cover jut has flex point, displacement pressure and confined pressure pressure reduction large time, gum cover, from the inside crimp of flex point, easily leaks, thus experiment pressure reduction not high.
Summary of the invention
The invention provides a kind of long core water injection test simulation system, to improve test accuracy, provide the experimental data of accurate measurement.
For this reason, the present invention proposes a kind of long core water injection test simulation system, and described long core water injection test simulation system comprises: long rock core holder, to be connected with described long rock core holder and the force (forcing) pump applying confined pressure and axle pressure to described long rock core holder and the displacement pump, measuring cell and the backpressure pump that are connected with described long rock core holder respectively;
Described long rock core holder comprises: clamper cylindrical shell 1 and the high pressure resistant rubber bush 2 be sheathed within described clamper cylindrical shell 1, and the space between described clamper cylindrical shell 1 and described high pressure resistant rubber bush 2 is confined pressure chamber; This long rock core holder is triaxial core holder, has radial confined pressure, and also has axial confined pressure.
Described high pressure resistant rubber bush 2 comprises: barrel 21, be arranged in the inner chamber 23 of described barrel 21 and be positioned at the nozzle at described inner chamber 23 two ends, and described inner chamber 23 is straight tube shape, and the internal diameter of the tube port position at described two ends equals the internal diameter of described inner chamber 23 middle;
Described high pressure resistant rubber bush 2 also comprises:
Sleeve flange 22, barrel 21 place in the outside of the projecting nozzle in every one end;
Skirt outer rim 221, is arranged on one end away from nozzle described in this on described sleeve flange 22; Described skirt outer rim 221 acutangulates with the axes intersect of described high pressure resistant rubber bush 2;
The madial wall at described clamper cylindrical shell 1 two ends respectively ring establishes front end boss 13 and rear end boss 14;
Described skirt outer rim 221 compresses mutually with described front end boss 13 and rear end boss 14, seals up described confined pressure chamber from radial direction.
Further, described skirt outer rim 221 is taper or conical ring.
Further, described skirt outer rim 221 is compressed with described front end boss 13 and rear end boss 14 mutually by the inwall of skirt outer rim 221.
Further, described long rock core holder comprises: the front end plug 3 and the rear end plug 4 that are arranged on the tube port position at described two ends respectively.
Further, described front end plug 3 comprises: the plug connecting portion 32 that pipeline 31 and pipeline are connected and plugged end 33; Described plugged end 33 extend in the nozzle of front end, and the external diameter of described plugged end 33 equals the internal diameter of the tube port position at described two ends.
Further, the location mid-shaft of described rear end plug 4 has the pipeline 41 for Liquid Flow, and the middle part of described rear end plug 4 has collar flange 42; Described rear end plug 4 has the insertion section 43 be positioned at before described collar flange 42, described insertion section 43 extend in the nozzle of rear end, the external diameter of described insertion section 43 equals the internal diameter of the tube port position at described two ends, and described collar flange 42 is provided with seal groove 421 and O-ring seal 422; The external diameter of described collar flange 42 is greater than the external diameter of described insertion section 43.
Further, the thickness of described barrel 21 is 10 ~ 10.6mm; Internal diameter is 2.54-3.81cm, and described sleeve flange 22 wall thickness is 14.9 ~ 15.3mm, and length is 15.1 ~ 15.5mm, and the width of described skirt outer rim 221 is 15.1 ~ 15.5mm.
Further, the axial length of the front end plug 3 of described long rock core holder is 5-10cm, and the axial length of described rear end plug 4 is 10-15cm.
Further, described long core water injection test simulation system also comprises: computer data acquiring control system, and displacement pump, measuring cell and backpressure pump that described computer data acquiring control system is connected with described force (forcing) pump, described long rock core holder respectively connect.
Further, the barrel of described long rock core holder 1 is provided with inlet, liquid outlet, confined pressure entrance 16 and at least two pressure tap joints.
In long core water injection test simulation system of the present invention, high pressure resistant rubber bush is different from conventional gum cover, the internal diameter of the tube port position at conventional gum cover two ends is greater than the internal diameter of inner chamber middle, because the internal diameter of clamper cylindrical shell 1 is determined, space between clamper cylindrical shell 1 and described high pressure resistant rubber bush 2, namely the radial dimension in confined pressure chamber 9 has restriction, in the finite space in confined pressure chamber, internal diameter by the tube port position at conventional gum cover two ends limits, the wall thickness of conventional gum cover can only be limited in less scope, and in the present invention, the inner chamber 23 of high pressure resistant rubber bush is straight tube shape, the internal diameter of the tube port position at two ends equals the internal diameter of described inner chamber 23 middle, therefore, the internal diameter that the wall thickness of high pressure resistant rubber bush can break through the tube port position at conventional gum cover two ends is greater than the restriction of the internal diameter of inner chamber middle, as long as the wall thickness of inner chamber 23 middle does not affect the finite space in confined pressure chamber, the wall thickness of high pressure resistant rubber bush can be more more abundant than existing conventional gum cover, larger pressure can be born.And the straight tubular construction of inner chamber 23 makes sleeve flange 22 become spirogyrate structure from concave shaped structure, like this, the sleeve flange 22 docked with the plug at sleeve 2 two ends just can occupy less space, thus gum cover barrel 21 can be thickeied.
The present invention improves on hermetically-sealed construction, makes clamper dead volume little, and experiment pressure reduction is high.Gum cover seal face place of the present invention does not have projection, inner chamber is straight tube shape, the internal diameter of the tube port position at described two ends equals the internal diameter of described inner chamber middle, there is not flex point of the prior art, even if displacement pressure and confined pressure pressure reduction large time, also there will not be the inside crimp of gum cover, do not allow leakiness, thus experiment pressure reduction can improve.
And then the front end plug 3 of long rock core holder and rear end plug 4 all extend in the nozzle of high pressure resistant rubber bush 2, and the axis of front end plug 3 and rear end plug 4 and radial dimension can be reduced.Like this, the long rock core holder that the aperture of front end plug 3 and rear end plug 4 is more conventional reduces 60%, and thus clamper total length shortens 15%.This gum cover allowable stress 60MPa, differential static pressure 20MPa.Meanwhile, the nozzle length more conventional gum cover nozzle length of gum cover is short, makes the total length of gum cover shorten 10%, thus reduces dead volume.
Long core water injection test simulation system of the present invention is for studying the reservoir damage mechanism in the injecting process, in effective announcement long cores the injecting process along journey damage character, and prevent that the determination in swollen radius and anti-swollen cycle provides theoretical and experimental basis for sensitive reservoir.This system can carry out long cores many pressure tap detections vertically, and effect of end surface is low, dead volume is little, quiet confined pressure large, and error in dipping is little.
Accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of the long core water injection test simulation system according to the embodiment of the present invention, and in figure, dotted line represents the connection of computer data acquiring control system, and solid line represents the connection of displacement system;
Fig. 2 is the longitudinal profile structural representation of the long rock core holder according to the embodiment of the present invention;
Fig. 3 a is the structural representation of the front end plug of long rock core holder according to the embodiment of the present invention;
Fig. 3 b is the structural representation of the front end set collar of long rock core holder according to the embodiment of the present invention;
Fig. 3 c is the structural representation of the front end cylindrical shell of long rock core holder according to the embodiment of the present invention;
Fig. 4 is according to the longitudinal sectional structure schematic diagram of the high pressure resistant rubber bush of the embodiment of the present invention;
Fig. 5 is the structure of sleeve flange according to the embodiment of the present invention and skirt outer rim;
Fig. 6 a is the structural representation of the rear end cylindrical shell of long rock core holder according to the embodiment of the present invention;
Fig. 6 b is the structural representation of rear end first set collar according to the long rock core holder of the embodiment of the present invention;
Fig. 6 c is the structural representation of the rear end plug of long rock core holder according to the embodiment of the present invention;
Fig. 6 d is the structural representation of rear end second set collar according to the long rock core holder of the embodiment of the present invention;
Fig. 7 is the high pressure resistant rubber bush structural representation of existing routine for long rock core holder.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and the specific embodiment of the present invention is described.
As shown in Figure 1, long core water injection test simulation system comprises: long rock core holder I, to be connected with described long rock core holder I and the force (forcing) pump II applying confined pressure and axle pressure to described long rock core holder and the displacement pump III (displacement pump III forms displacement system by connection) be connected with described long rock core holder I respectively, backpressure pump IV and measuring cell V;
As shown in Figure 2, described long rock core holder comprises: clamper cylindrical shell 1 and the high pressure resistant rubber bush 2 be sheathed within described clamper cylindrical shell 1, space between described clamper cylindrical shell 1 and described high pressure resistant rubber bush 2 is confined pressure chamber, particularly, clamper cylindrical shell 1 inwall, front end boss 13, rear end boss 14 and high pressure resistant rubber bush 2 outer wall form ring-type confined pressure chamber 9;
Described high pressure resistant rubber bush 2 comprises: barrel 21, be arranged in the inner chamber 23 of described barrel 21 and be positioned at the nozzle at described inner chamber 23 two ends, described inner chamber 23 is straight tube shape, rock core 8 is arranged in inner chamber 23, the nozzle at two ends blocks rock core 8 with plug respectively, and the internal diameter of the tube port position at described two ends equals the internal diameter of described inner chamber 23 middle, high pressure resistant rubber bush of the present invention is different from conventional gum cover, as Fig. 7, the internal diameter of the tube port position at conventional gum cover 200 two ends is greater than the internal diameter of inner chamber 230 middle, namely conventional gum cover two ends have enlarging 280, because the internal diameter of clamper cylindrical shell is determined, space between clamper cylindrical shell and described high pressure resistant rubber bush, namely the radial dimension in confined pressure chamber has restriction, in the finite space in confined pressure chamber, internal diameter by the tube port position at conventional gum cover two ends limits, sidewall 210 wall thickness of conventional gum cover can only be limited in less scope, and in the present invention, the inner chamber 23 of high pressure resistant rubber bush is straight tube shape, the internal diameter of the tube port position at two ends equals the internal diameter of described inner chamber 23 middle, therefore, the internal diameter that the wall thickness of high pressure resistant rubber bush can break through the tube port position at conventional gum cover two ends is greater than the restriction of the internal diameter of inner chamber middle, as long as the wall thickness of inner chamber 23 middle does not affect the finite space in confined pressure chamber, the wall thickness of high pressure resistant rubber bush can be more more abundant than existing conventional gum cover, larger pressure can be born.Meanwhile, the nozzle length more conventional gum cover nozzle length of gum cover is short, the total length of gum cover is shortened, thus reduces dead volume;
Described high pressure resistant rubber bush 2 also comprises:
Sleeve flange 22, barrel 21 place in the outside of the projecting nozzle in every one end;
As shown in Figure 2 and Figure 4, skirt outer rim 221, is arranged on one end away from nozzle described in this on described sleeve flange 22; Described skirt outer rim 221 acutangulates with the axes intersect of described high pressure resistant rubber bush 2, or, the opening direction of skirt outer rim 221 and the towards the opposite of this end nozzle, the two ends of high pressure resistant rubber bush 2 are not always the case; Such as, in Fig. 2, the opening direction of the skirt outer rim 221 of left end is towards right (visible Fig. 4 and Fig. 5); And the nozzle of left end towards being towards a left side; The opening direction of the skirt outer rim 221 of right-hand member is towards left (visible Fig. 4 and Fig. 5); And the nozzle of right-hand member towards being towards the right side; This structure both Packed effects of skirt outer rim 221, have positioning action again, and sealing effectiveness are better;
As Fig. 3 c, the madial wall at described clamper cylindrical shell 1 two ends respectively ring establishes front end boss 13 and rear end boss 14, and front end boss 13 and rear end boss 14 are all radially-inwardly given prominence to;
Described skirt outer rim 221 compresses mutually with described front end boss 13 and rear end boss 14, seals up described confined pressure chamber from radial direction.Clamper cylindrical shell 1 inwall, front end boss 13, rear end boss 14 and high pressure resistant rubber bush 2 outer wall form ring-type confined pressure chamber 9, and when adding confined pressure, skirt outer rim 221 is close to front end boss 13 and rear end boss 14 under pressure, strengthens sealing function.Further, described skirt outer rim 221 is taper or conical ring, better to seal.
And then, gum cover seal face place of the present invention does not have projection, in other words, gum cover seal face is flat, and inner chamber is straight tube shape, the internal diameter of the tube port position at described two ends equals the internal diameter of described inner chamber middle, there is not flex point of the prior art, though displacement pressure and confined pressure pressure reduction large time, also there will not be the inside crimp of gum cover, do not allow leakiness, thus experiment pressure reduction can improve.
Further, described skirt outer rim 221 is compressed with described front end boss 13 and rear end boss 14 mutually by the inwall of skirt outer rim 221, and sealing effectiveness is better.Further, the width of described skirt outer rim 221 is 15.1 ~ 15.5mm, can realize, under the condition keeping better sealing effectiveness, reducing dead volume.
Further, as Fig. 2, described long rock core holder comprises: the front end plug 3 and the rear end plug 4 that are arranged on the tube port position at described two ends respectively, to realize the sealing at rock core 8 two ends.The front end plug 3 of long rock core holder and rear end plug 4 all extend in the nozzle of high pressure resistant rubber bush 2, and the axis of front end plug 3 and rear end plug 4 and radial dimension can be reduced.Like this, the long rock core holder that the aperture of front end plug 3 and rear end plug 4 is more conventional reduces 60%, and thus clamper total length shortens 15%.
Further, as Fig. 3 a, described front end plug 3 comprises: the plug connecting portion 32 that pipeline 31 and pipeline are connected and plugged end 33; Described plugged end 33 extend in the nozzle of front end, and the external diameter of described plugged end 33 equals the internal diameter of the tube port position at described two ends.Pipeline 31 is communicated to the left side of rock core, is inlet and outlet piping or the displacement passage of displacement.The outer shape of plugged end 33 and the shape of high pressure resistant rubber bush 2 inner chamber 23 are coincide, and it inserts in inner chamber 23 and its end face is supported on the end face of rock core 8.Like this, axis and the radial dimension of front end plug 3 can be reduced.
Further, as Fig. 6 c, the location mid-shaft of described rear end plug 4 has the pipeline 41 for Liquid Flow, and pipeline 41 is communicated to the right side of rock core, is inlet and outlet piping or the displacement passage of displacement; The middle part of described rear end plug 4 has collar flange 42; Described rear end plug 4 has the insertion section 43 be positioned at before described collar flange 42, described insertion section 43 extend in the nozzle of rear end, the external diameter of described insertion section 43 equals the internal diameter of the tube port position at described two ends, and described collar flange 42 is provided with seal groove 421 and O-ring seal 422; The external diameter of described collar flange 42 is greater than the external diameter of described insertion section 43.The inner diameter shape of the set collar link 62 of collar flange 42 outer shape and the first set collar coincide.The outer shape of rear end plug 4 front portion (i.e. insertion section 43) and the inner chamber 23 of high pressure resistant rubber bush 2 coincide.Like this, axis and the radial dimension of rear end plug 4 can be reduced, be convenient to sealing.
Further, the axial length of high pressure resistant rubber bush 2 is 25.0 ~ 35.0cm, because inner chamber 23 is straight tube shape, so the axial length of inner chamber 23 is 25.0 ~ 35.0cm; The thickness of described barrel 21 is 10 ~ 10.6mm; Internal diameter is 2.54-3.81cm, and described sleeve flange 22 wall thickness is 14.9 ~ 15.3mm, and length is 15.1 ~ 15.5mm, and the width of described skirt outer rim 221 is 15.1 ~ 15.5mm.Further, the axial length of front end plug 3 is 5-10cm, and the axial length of described rear end plug 4 is 10-15cm, and the diameter of the pipeline 31 of front end plug 3 is 0.5-2mm, and the diameter of the pipeline 41 of described rear end plug 4 is 0.5-2mm.This gum cover allowable stress 60MPa, differential static pressure 20MPa.Simultaneously, the nozzle length more conventional gum cover nozzle length of gum cover is short, and make the total length of gum cover shorten 10%, thus clamper total length shortens 15%, the plug of clamper rear and front end and the aperture of joint is more conventional reduces 60%, further reduces dead volume.
Further, as Fig. 1, described long core water injection test simulation system also comprises: computer data acquiring control system VI (abbreviation data acquisition system (DAS)), displacement pump, measuring cell and backpressure pump that described computer data acquiring control system VI is connected with described force (forcing) pump, described long rock core holder respectively connect.Can carry out long cores many pressure tap detections vertically by computer data acquiring control system VI, measure accurately, fast, data are comprehensive, and error in dipping is little.
Further, as Fig. 1 and Fig. 2, the barrel of described long rock core holder 1 is provided with inlet, liquid outlet, confined pressure entrance 16 and at least two pressure tap joints (being such as pressure tap joint 151 and pressure tap joint 152).The barrel of long rock core holder 1 is also provided with axle pressure entrance 63.Confined pressure entrance 16 is all connected with force (forcing) pump II with axle pressure entrance 63, to realize axle pressure and confined pressure is loaded by same pump; Inlet, liquid outlet and confined pressure entrance 16 arrange measuring cell V respectively, to measure.
Introduce the syndeton of the embodiment of a more specifically long core water injection test simulation system and principle of work and process below:
As shown in Figure 1, long core water injection test simulation system comprises long rock core holder I, force (forcing) pump II, displacement pump III, backpressure pump IV, measuring cell V, and computer data acquiring control system VI.The main composition of its equipment and performance parameter are in table 1.
Table 1
As shown in Figure 2, long rock core holder comprises clamper cylindrical shell 1, high pressure resistant rubber bush 2, front end plug 3, rear end plug 4, front end set collar 5, rear end first set collar 6 and rear end second set collar 7.
As shown in Fig. 2, Fig. 3 a, Fig. 3 b, Fig. 3 c and Fig. 6 a, Fig. 6 b, Fig. 6 c and Fig. 6 d, clamper cylindrical shell 1 is cylindrical shape, and wherein establishing flange apart from 3.0cm place, nozzle edge ring inside left end barrel, is front end boss 13; Establishing flange apart from 3.0cm place, nozzle edge ring inside right-hand member barrel, is rear end boss 14; As Fig. 3 c, this front end boss 13 to nozzle marginal portion is front plug interface 11, and as Fig. 6 a, rear end boss 13 to nozzle marginal portion is rear plug interface 12; Inside the barrel of front plug interface 11 and rear plug interface 12 part, internal thread 111 and internal thread 121 are set respectively; The barrel of clamper cylindrical shell 1 is arranged confined pressure entrance 16 and at least two pressure tap joints, be respectively pressure tap joint 151 and pressure tap joint 152.
As shown in Fig. 2, Fig. 4 and Fig. 5, high pressure resistant rubber bush 2 is cylinders that rubber is made, the thickness of barrel 21 is 10.6mm, on the outer wall of two ends nozzle, ring establishes sleeve flange 22 (being called for short flange 22) respectively, the wall thickness at flange 22 place is 15.15mm, and the axial length of flange portion is 15.5mm.Establish skirt outer rim 221 at this flange away from an end ring of nozzle, the opening direction of this outer rim 221 and the towards the opposite of this flange 22, the width of skirt outer rim 221 is 15.5mm.Barrel 21 arranges at least two pressure measurement interfaces, pressure measurement interface 211 and pressure measurement interface 212; Rock core 8 is held in inner chamber 23; The axial length of this inner chamber 23 is 34.94cm, and internal diameter is 2.57cm.
High pressure resistant rubber bush 2 is positioned in clamper cylindrical shell 1, and the outer wall of its two end boss 22 fits tightly with the front end boss 13 of clamper cylindrical shell and the medial surface of rear end boss 14 respectively; Both sides skirt outer rim 221 is stretched in this front end boss 13 and rear end boss 14 side towards clamper inner barrel respectively; Ring-type confined pressure chamber 9 is formed by clamper cylindrical shell 1 inwall, front end boss 13, rear end boss 14 and high pressure resistant rubber bush 2 outer wall.
As shown in Figure 3 a, front end plug 3 comprises plug connecting portion 32 and plugged end 33 that pipeline 31 and pipeline are connected; Plug connecting portion 32 outer wall arranges external thread 321.As shown in Figure 2, the outer shape of plugged end 33 and the shape of high pressure resistant rubber bush 2 inner chamber 23 are coincide, and it inserts in inner chamber 23 and its end face (right side of plugged end 33) is supported on the end face of rock core 8.The axial length of front end plug 3 is 6.1cm.The diameter (internal diameter) of pipeline 31 is 1.5mm.
As shown in Figure 3 b, front end set collar 5 comprises plug link 51 and front end cylindrical shell link 52; The inwall of this plug link 51 is arranged internal thread 511, be spirally connected with the external thread 321 on plug connecting portion 32.As shown in Figure 2, the outer wall of front end cylindrical shell link 52 arranges external thread 521, be spirally connected with the internal thread 111 on front plug interface 11; The end face of this front end cylindrical shell link 52 is supported on the end face of high pressure resistant rubber bush 2.
As shown in Figure 6 b, rear end first set collar 6 comprises rear end cylindrical shell link 61 and set collar link 62, for fixing front end plug 3 and rear end plug 4; The outer wall of this rear end cylindrical shell link 61 arranges external thread 611, is spirally connected with the internal thread 121 on rear plug interface 12.The outer wall of set collar link 62 is arranged axle pressure entrance 63; The end face of set collar link 62 is arranged at least three screws 621.As shown in Figure 2, the end face of rear end cylindrical shell link 61 is supported on the end face of high pressure resistant rubber bush 2.
As fig. 6 c, the axis of rear end plug 4 has the pipeline 41 for Liquid Flow, and the diameter of pipeline 41 is 0.15cm.The middle part of rear end plug 4 has collar flange 42, and collar flange 42 pressed on ring establishes seal groove 421.The inner diameter shape of the set collar link 62 of collar flange 42 outer shape and the first set collar coincide.The outer shape of rear end plug 4 front portion 43 and the inner chamber 23 of high pressure resistant rubber bush 2 coincide, and coincide with the inner diameter shape of the rear end cylindrical shell link 61 of the first set collar.As shown in Figure 2, rear end plug 4 is through rear end first set collar 6, the end face of its front portion 43 is supported on the end face of rock core 8, and the outer wall of its front portion 43 and collar flange 42 fits tightly with the rear end cylindrical shell link 61 of the first set collar 6 and the inwall of set collar link 62 respectively; As Fig. 2, in the seal groove 421 on collar flange 42, O-ring seal 422 is set.The axial length of rear end plug 4 is 15cm.
As shown in fig 6d, the inner diameter shape of rear end second set collar 7 and rear portion 44 outer shape of rear end plug are coincide; The end face of rear end second set collar 7 arranges at least three screws 72, and its position is corresponding with the screw 621 on the set collar of rear end first respectively.As shown in Figure 2, rear end second set collar 7 is set in the periphery of rear end plug 4, arranges O-ring seal 73 between the two.Rear end second set collar 7 is fixed on rear end first set collar 6 by the screw 72 be located between the screw 72 on the set collar of rear end second and the screw 621 on set collar link.Outer wall at the inwall of clamper cylindrical shell 1, the rear portion 44 of rear end plug, between collar flange 42 and rear end second set collar 7, form section roller to pressure chamber 10.
Taken out from long rock core holder by front and back ends plug, and be full of water by the passage shared by front and back ends plug, the volume measuring water is the dead volume of front and back ends plug.Measurement result long rock core holder front end dead volume is 400mm
3, rear end dead volume is 370mm
3, be only 20% of conventional long rock core holder.The highest quiet confined pressure is 20MPa, and working pressure is 0-60MPa.
The long cores that this long rock core holder can hold Φ 25mm*300mm carries out various simulation flood-pot-test, and it can carry out many pressure taps vertically and detect, and effect of end surface is low, dead volume is little, quiet confined pressure large, and error in dipping is little.
(3) System Working Principle
The 3-D stree field of three axial hydrostatic confined pressure simulations suffered by reservoir that this system utilizes force (forcing) pump II to provide, endpiece adds back pressure, simulated formation pressure.The employing of simulation flood-pot experiment is found time saturated online, determines different displacement working fluids according to different long cores features.Concrete implementation procedure is as follows:
(1) normal temperature constant weight after rock core drying, takes dry weight, calculates each endpiece dead volume of clamper;
(2) load rock core, survey air permeability;
(3) to find time online operate in saturation liquid (different core character adopt different operating liquid), and calculate the volume of voids Vp of long cores;
(4) carry out liquid with working fluid and survey permeability test;
(5) water filling dynamic experiment (comprising water-sensitive experiment, anti-swollen experiment and anti-swollen cycle experimental etc.) is carried out according to different long core experiment schemes;
(6) weigh rock core weight in wet base after having tested, and relevant experimental data is processed and analyzes.
The present invention for studying the reservoir damage mechanism in the injecting process, effectively disclose in long cores the injecting process along journey damage character, and prevent that the determination in swollen radius and anti-swollen cycle provides theoretical and experimental basis for sensitive reservoir.The present invention can carry out long cores many pressure tap detections vertically, and effect of end surface is low, dead volume is little, quiet confined pressure large, and error in dipping is little.
The foregoing is only the schematic embodiment of the present invention, and be not used to limit scope of the present invention.For each ingredient of the present invention can mutually combine under the condition of not conflicting, any those skilled in the art, equivalent variations done under the prerequisite not departing from design of the present invention and principle and amendment, all should belong to the scope of protection of the invention.
Claims (6)
1. a long core water injection test simulation system, it is characterized in that, described long core water injection test simulation system comprises: long rock core holder, to be connected with described long rock core holder and the force (forcing) pump applying confined pressure and axle pressure to described long rock core holder and the displacement pump, measuring cell and the backpressure pump that are connected with described long rock core holder respectively;
Described long rock core holder comprises: clamper cylindrical shell (1) and the high pressure resistant rubber bush (2) be sheathed within described clamper cylindrical shell (1), and the space between described clamper cylindrical shell (1) and described high pressure resistant rubber bush (2) is confined pressure chamber;
Described high pressure resistant rubber bush (2) comprising: barrel (21), be arranged in the inner chamber (23) of described barrel (21) and be positioned at the nozzle at described inner chamber (23) two ends, described inner chamber (23) is straight tube shape, and the internal diameter of the tube port position at described two ends equals the internal diameter of described inner chamber (23) middle;
Described high pressure resistant rubber bush (2) also comprises:
Sleeve flange (22), barrel (21) place in the outside of the projecting nozzle in every one end;
Skirt outer rim (221), is arranged on one end away from nozzle described in this on described sleeve flange (22); Described skirt outer rim (221) acutangulates with the axes intersect of described high pressure resistant rubber bush (2);
The madial wall at described clamper cylindrical shell (1) two ends respectively ring establishes front end boss (13) and rear end boss (14);
Described skirt outer rim (221) compresses mutually with described front end boss (13) and rear end boss (14), seals up described confined pressure chamber from radial direction;
Described long rock core holder comprises: the front end plug (3) and the rear end plug (4) that are arranged on the tube port position at described two ends respectively;
Described front end plug (3) comprising: the plug connecting portion (32) that pipeline (31) and pipeline are connected and plugged end (33); Described plugged end (33) extend in the nozzle of front end, and the external diameter of described plugged end (33) equals the internal diameter of the tube port position at described two ends;
The location mid-shaft of described rear end plug (4) has the pipeline (41) for Liquid Flow, and the middle part of described rear end plug (4) has collar flange (42); Described rear end plug (4) has the insertion section (43) be positioned at before described collar flange (42), described insertion section (43) extend in the nozzle of rear end, the external diameter of described insertion section (43) equals the internal diameter of the tube port position at described two ends, and described collar flange (42) is provided with seal groove (421) and O-ring seal (422); The external diameter of described collar flange (42) is greater than the external diameter of described insertion section (43);
Described long core water injection test simulation system also comprises: computer data acquiring control system, and displacement pump, measuring cell and backpressure pump that described computer data acquiring control system is connected with described force (forcing) pump, described long rock core holder respectively connect.
2. long core water injection test simulation system as claimed in claim 1, it is characterized in that, described skirt outer rim (221) is taper or conical ring.
3. long core water injection test simulation system as claimed in claim 2, it is characterized in that, described skirt outer rim (221) is compressed with described front end boss (13) and rear end boss (14) mutually by the inwall of skirt outer rim (221).
4. long core water injection test simulation system as claimed in claim 2, it is characterized in that, the thickness of described barrel (21) is 10 ~ 10.6mm; Internal diameter is 2.54-3.81cm, and described sleeve flange (22) wall thickness is 14.9 ~ 15.3mm, and length is 15.1 ~ 15.5mm, and the width of described skirt outer rim (221) is 15.1 ~ 15.5mm.
5. long core water injection test simulation system as claimed in claim 1, it is characterized in that, the axial length of the front end plug (3) of described long rock core holder is 5-10cm, and the axial length of described rear end plug (4) is 10-15cm.
6. long core water injection test simulation system as claimed in claim 1, it is characterized in that, the barrel of described long rock core holder (1) is provided with inlet, liquid outlet, confined pressure entrance (16) and at least two pressure tap joints.
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| CN201310132940.1A CN103245769B (en) | 2013-04-17 | 2013-04-17 | Long core water injection test simulation system |
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| CN106940289B (en) * | 2017-04-28 | 2023-10-24 | 中国石油大学(北京) | Thermal shrinkage sealing type multi-measuring-point oil-gas exploitation simulation device |
| CN107576573A (en) * | 2017-09-22 | 2018-01-12 | 浙江海洋大学 | A kind of compact rock core microcrack development detection means and method |
| CN110470514B (en) * | 2019-08-09 | 2021-08-31 | 中国石油天然气股份有限公司 | Method for inducing cracks in low-permeability reservoir core through circulating water injection freeze thawing |
| CN112627786B (en) * | 2020-12-14 | 2022-02-08 | 浙江海洋大学 | Ultra-low permeability oil reservoir CO2Displacement process experimental method and device |
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